Selection Tips for Digital Sound Level Meters
A noise meter, also known as a sound level meter, is an instrument that measures the sound pressure level or sound level of sound based on a certain frequency and time weighting. It is the most basic and commonly used instrument in acoustic measurement. Sound level meters can be used for measuring environmental noise, machine noise, vehicle noise, and various other types of noise. They can also be used for electroacoustics, building acoustics, and other measurements. If a condenser microphone is replaced with an accelerometer sensor and an integrator is added, a sound level meter can be used to measure vibration. Humidity sensor probe, stainless steel electric heating tube PT100 sensor, cast aluminum heater, heating coil fluid solenoid valve
In order to compare the measurement results of sound level meters produced by countries around the world, the International Electrotechnical Commission (IEC) has developed relevant standards for sound level meters and recommended that countries adopt them. In May 1979, the IEC 651 "Sound Level Meter" standard was passed in Stockholm. The national standard for sound level meters in China is GB3785-83 "Electrical and Acoustic Performance and Testing Methods for Sound Level Meters". In 1984, IEC passed the international standard IEC804 "Integral Average Sound Level Meter", and China promulgated GB/T17181-1997 "Integral Average Sound Level Meter" in 1997. They are mainly consistent with the IEC standards. In 2002, the International Electrotechnical Commission (IEC) released the new international standard IEC61672-2002 "Sound Level Meters". This standard replaces the original IEC651-1979 "Sound Level Meter" and IEC804-1983 "Integral Average Sound Level Meter". China has formulated the JJG188-2002 "Sound Level Meter" verification regulation based on this standard. According to the new standards, sound level meters can be classified into general sound level meters, integral sound level meters, spectral sound level meters, etc., and can be classified into level 1 and level 2 according to accuracy. The various performance indicators of the two levels of sound level meters have the same central value, only the allowable error is different, and as the level number increases, the allowable error is relaxed. According to volume, it can also be divided into desktop, portable, and pocket sound level meters. According to its indication method, it can be divided into analog indication and digital indication sound level meters. Selection Techniques for Digital Noise Meters
